On Dec. 29, Valery Gergiev will lead the Mariinsky Orchestra and Chorus, the Student Chorus of the Popov Academy of Choral Art and the State Academic Kozhevnikov Chorus of the Moscow Region at the Tchaikovsky Concert Hall in Verdi’s “Requiem.” The soloists will include Tatiana Serjan (soprano), Yulia Matochkina (mezzo-soprano), Najmiddin Mavlyanov (tenor), Ildar Abdrazakov (bass). The company announced that the concert would “be dedicated to the memory of the victims of the Tupolev-154 air {…}